1. In eukaryotes, there are atleast 3- rna polymerase enzymes in the nucleus.
2. RNA polymerase I transcribes r-RNAs, RNA polymerase II transcribes the precursor of m-RNA called as heteronuclear RNA.
3. RNA polymerase III catalyses transcription of t-RNA.
4. The primary transcript contains both exons and introns and are non- functional.
5. It is subjected to a process called splicing where the introns are removed and the exons are joined in a definite order to form m-RNA.
6. The heterogenous nuclear RNA undergoes 2 additional process called capping and tailing. In capping methyl guanosine tri- phosphate is added to the 5' end of the hn RNA.
7. In tailing adenylate residues are added to the 3' end of hn RNA.
8. The full processed hn RNA is called m-RNA and is released from its nucleus to its cytoplasm.
due to the abve reasons, transcription is a complex process in eukaryotic cells.
